Processable precursor polymers to aramids, poly(imino-l,4-phenyleneiminocarbonyl-l,4-phenylenecarbonyl) and poly(imino-l,3-phenyleneiminocarbonyl-l,4-phenylenecarbonyl), were prepared and studied. The precursor polymers were made from the reaction of 2,5-dichlorobicyclo[2.2.2]octane-l,4-dicarbonyl chloride with 1,4-phenylenediamine or 1,3-phenylenediamine. The polymeric precursors were subsequently converted in approximately 97% yields, via dehydrohalogenation and retro Diels-Adler reactions, to the corresponding aramids by refluxing in 1 M solution of potassium hydroxide or sodium hydroxide. Only the p-phenylene precursor polymer exhibited liquid crystal characteristics in solution. The solubility and thermal properties were examined.
Посилання на статтю:
Precursor polymers: 1. Synthesis and characterization of processable precursors to aramids / Issifu I. Harruna* and Kofi B. Bota and Sherita D. McLamore // Polymer. – 1993. – Vol 34. – P. 3328-3331.